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Well it's a bit difficult since there are many possible reasons why it's not working. What format have you saved your image in? Try saving it as a jpeg or png if it's not one of those formats already. Otherwise, maybe upload it to Photobucket/imgur/******* and copy and paste the URL into the box and that might work.

What format is the image in? If it's in a weird file format that the forum doesn't recognise it may be rejected. Alternatively, do as zhanton suggests. Upload it to a image hosting website and use the url link instead. If you get the same error message on those sites, then your problem is with the image file. It may be corrupted, try res-aving it with a new format (PNG would be best)